Ngl, I’ve been rubbing my hands over that idea muttering “my precious, my precious” since I saw that casting call, and now especially with IW ending. Okay, points in favor:

1. There was a casting call for twins.
2. There are somewhat credible rumors that a 16-year-old has been cast as Cassie Lang, specifically for Avengers 4. That’s 5-6 years older than the 10-year-old who played her in Ant-Man. Since Mar’Vell will be joining the MCU in Captain Marvel, and Hawkeye is going to have some solo adventures in Avengers 4 (Kate?) we may very well be primed for the Young Avengers.
   
3. And if we are primed for them, this is pretty much their only chance to bring in Tommy and Billy with anything close to resembling their comic book heritage. 

Counterpoints:

1. The casting call was only for two days and went out very shortly before the role was needed and for a pretty small pay rate, and for young actors twins are often cast so that they can film around labor law constraints. This implies this is a very small role, which if Wanda’s got babies that’s going to be majorly important to her arc.
2. The casting call was for 2-year-olds, not 5-year-olds. If we’re talking about a time skip, the years don’t add up.
3. They could just bring in Wiccan and Speed with no connection to Wanda and/or Vision.

But those counterpoints are dependent on the idea the casting call was the only actors being cast for the twins. But realistically, they would had their casting director find suitable actors–I’ll point out we had no idea who the actress for young Gamora was until about a month before the movie, and that’s because she told us herself. So we wouldn’t realistically be clued into the Minimoffs until we got a trailer for them.

But–be careful what we wish for. The point in bringing Billy and Tommy in is so we can have Wiccan and Speed, and we can’t have them without the age up. Which means if we get the boys, then we’re going to lose the boys too. Poor Wanda…